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CVE: CVE-2022-0908
Upstream-Status: Backport
Signed-off-by: Ross Burton <ross.burton@arm.com>
From ef5a0bf271823df168642444d051528a68205cb0 Mon Sep 17 00:00:00 2001
From: Even Rouault <even.rouault@spatialys.com>
Date: Thu, 17 Feb 2022 15:28:43 +0100
Subject: [PATCH 4/6] TIFFFetchNormalTag(): avoid calling memcpy() with a null
source pointer and size of zero (fixes #383)
---
libtiff/tif_dirread.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/libtiff/tif_dirread.c b/libtiff/tif_dirread.c
index d84147a0..4e8ce729 100644
--- a/libtiff/tif_dirread.c
+++ b/libtiff/tif_dirread.c
@@ -5079,7 +5079,10 @@ TIFFFetchNormalTag(TIFF* tif, TIFFDirEntry* dp, int recover)
_TIFFfree(data);
return(0);
}
- _TIFFmemcpy(o,data,(uint32_t)dp->tdir_count);
+ if (dp->tdir_count > 0 )
+ {
+ _TIFFmemcpy(o,data,(uint32_t)dp->tdir_count);
+ }
o[(uint32_t)dp->tdir_count]=0;
if (data!=0)
_TIFFfree(data);
--
2.25.1
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